Mendes, who released Shawn Mendes: The Album earlier this year, assumed the role of fanboy on the final night of Styles' tour at the The Forum in Los Angeles on Saturday (July 14). In the clip below, Mendes head-bangs, first-pumps and more generally loses his mind throughout Styles' set.

And fans couldn't get enough.

"Everyone has depression because that was Harry's final show," one wrote, while another noted "I love when legends I stan are supportive of each other."

"This doesn’t happen to people like me very often at all, and there is one single reason why I get to do this job and it’s because of every single one of you," he said, before spotting a fan holding a sign that read, "I'm gay and I love you," to which Styles replied: "We’re all a little bit gay, aren’t we?”

And he doubled down on his gratitude to fans.

"I love you so much. Thank you, thank you, thank you from the bottom of my heart,” he added. “I’m gonna go away for a little while and make some more music, and then I’ll see you very soon."